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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
Golgi tendon organ. The Golgi tendon organ (GTO) (also called Golgi organ, tendon organ, neurotendinous organ or neurotendinous spindle) is a proprioceptive sensory receptor organ that senses changes in muscle tension. It lies at the origins and insertion[1] of skeletal muscle fibers into the tendons of skeletal muscle.